Like
I discussed
last year, we will be moving to a more nimble release
process with Mono 3.0. We are trying to reduce our inventory
of pending work and get new features to everyone faster.
This means that our "master" branch will remain stable from
now on, and that large projects will instead be developed in
branches that are regularly landed into our master branch.

What is new

Check
our release
notes for the full details of this release. But here
are some tasty bits:

C# Async compiler

Unified C# compiler for all profiles

4.5 Async API Profile

Integrated new Microsoft's Open Sourced stacks:

ASP.NET MVC 4

ASP.NET WebPages

Entity Framework

Razor

System.Json (replaces our own)

New High performance Garbage Collector (SGen -
with many performance and scalability improvements)